The end of my tether

My son did his GCSE's last year and got E's,F's and a D. I was so proud of him because he only got his EHC February just gone. The problem I keep  coming up against is that mainstream education (collage) hasn't got a clue. I've applied to a specialist provision but was turned down due to a couple of reasons,

As I explained to the collage he's at, at the moment, he has Asperges so his understanding of social interaction is limited and has never been in a situation where he's around 'vulnerable adults' like himself  (he's only ever been in mainstream) This changed when he went into foundation stage at collage.

As a young man almost leaving his teens, he has a certain thought process. He liked one of the girls in his class and wanted to take her for something to eat. The young lady agreed but wasn't comfortable and complained about it when they got back to collage (as I would expect and encourage anyone who feels uncomfortable to do). My son was warned and asked to not do it again. He spoke to this lass again to explain and try and be friends again. During this process he asked her for kisses and cuddles. Once again a complaint was made  (again, totally understandable) my son was then suspended.

During the reintegration meeting, I explained that he needs guidance and support in understanding what is appropriate behaviour. He was then accepted back into collage under the proviso that this not happen again. IT HAS NOT HAPPENED AGAIN! However during the assessment process for the new specialist provision, a telephone call was made between the two collages. I'm not privy to the conversation, however based on that conversation he was rejected due to being a risk to female students.

He was made to sound like a sexual predictor who preys solely on weak, vulnerable girls who can't look after themselves. He sounded like a dangerous and despicable human being, who shouldn't be allowed anywhere near decent society in general. 

This conversation has now been had twice,  both times it has caused pain and suffering to my son. He's been banned from seeing his 'girlfriend' because the collage rang up her parent and had a similar conversation with them.

I don't know what else I can do. He's refusing to go back to the collage he's registered at,  at the moment and he's got nowhere to go to. He has an EHC that's not worth the paper it's written on and he's become a recluse again  (oh, I should also point out that recently he was diagnosed with complex PTSD due to abuse he's suffered pretty much all of his school career) He is not a danger and if anything is overly protective of females but it seems that I can't stop things being said. He's now in a situation where he's not in education or adult training and by the looks of it he won't be any time soon because obviously the collage have every right to voice their concern for others safety. I truly have no idea what to do next. 

As a last piece of information,  I myself am limited in my abilities at times. I have generalised anxiety disorder, social phobia and Fibromyalgia. So these limit my ability to be there 24/7. Although as his sole parent and carer it's my job. Please,  if you have any advice I'm all ears.